JPH0136196B2 - - Google Patents
Info
- Publication number
- JPH0136196B2 JPH0136196B2 JP58130438A JP13043883A JPH0136196B2 JP H0136196 B2 JPH0136196 B2 JP H0136196B2 JP 58130438 A JP58130438 A JP 58130438A JP 13043883 A JP13043883 A JP 13043883A JP H0136196 B2 JPH0136196 B2 JP H0136196B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- flexible magnetic
- magnetic disk
- weight
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 150000001875 compounds Chemical class 0.000 claims description 11
- 239000000314 lubricant Substances 0.000 claims description 11
- 229920001296 polysiloxane Polymers 0.000 claims description 11
- 239000011241 protective layer Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 150000008365 aromatic ketones Chemical class 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 238000012986 modification Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- -1 fatty acid ester Chemical class 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
- 229920002635 polyurethane Polymers 0.000 description 5
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- KMNCBSZOIQAUFX-UHFFFAOYSA-N 2-ethoxy-1,2-diphenylethanone Chemical compound C=1C=CC=CC=1C(OCC)C(=O)C1=CC=CC=C1 KMNCBSZOIQAUFX-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 2
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 2
- VVBLNCFGVYUYGU-UHFFFAOYSA-N 4,4'-Bis(dimethylamino)benzophenone Chemical compound C1=CC(N(C)C)=CC=C1C(=O)C1=CC=C(N(C)C)C=C1 VVBLNCFGVYUYGU-UHFFFAOYSA-N 0.000 description 2
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
- CPWDRRLIHVAVKK-UHFFFAOYSA-N C(CCCCCCCCCCCCC)(=O)O.[F] Chemical compound C(CCCCCCCCCCCCC)(=O)O.[F] CPWDRRLIHVAVKK-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 235000021360 Myristic acid Nutrition 0.000 description 2
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 1
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 1
- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 description 1
- PIZHFBODNLEQBL-UHFFFAOYSA-N 2,2-diethoxy-1-phenylethanone Chemical compound CCOC(OCC)C(=O)C1=CC=CC=C1 PIZHFBODNLEQBL-UHFFFAOYSA-N 0.000 description 1
- RXOZTUMCVTYUNS-UHFFFAOYSA-N 2,6-dimethylheptan-4-one;2-hydroxy-1,2-diphenylethanone Chemical compound CC(C)CC(=O)CC(C)C.C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 RXOZTUMCVTYUNS-UHFFFAOYSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
- 239000012965 benzophenone Substances 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- XENVCRGQTABGKY-ZHACJKMWSA-N chlorohydrin Chemical compound CC#CC#CC#CC#C\C=C\C(Cl)CO XENVCRGQTABGKY-ZHACJKMWSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229940117389 dichlorobenzene Drugs 0.000 description 1
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
- G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
- G11B23/0028—Details
- G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/82—Disk carriers
- G11B5/825—Disk carriers flexible discs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/90—Magnetic feature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
- Y10T428/24322—Composite web or sheet
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
- Y10T428/31609—Particulate metal or metal compound-containing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
Description
本発明はフレキシブル磁気デイスクの改良に関
し、さらに詳しくは書込みおよび読取り用装置に
偏心することなく装填されるフレキシブル磁気デ
イスクに関する。
フレキシブルな磁気デイスクシートをジヤケツ
トに収納し、ジヤケツトとシートの両方に設けた
中央円孔に書込みおよび読取り用装置のシート位
置決め部材を係合せしめ、これを回転させてシー
ト上に磁気記録をし、あるいはシートから磁気再
生するものが知られている。この種の磁気デイス
クはシートがジヤケツトに多少余裕をもつて収納
されているため、保管時、取扱時あるいは携帯時
に中のシートがジヤケツト内で片寄つた位置にず
れ、装置にデイスクを装填したとき、シート中央
の円孔が装置の位置決め部材（コレツト）の位置
に対して偏心し、位置決め時にシートが偏心した
位置に保持されてしまうことがある。
第１Ａおよび１Ｂ図はこの種のフレキシブル磁
気シートを示すもので、中央に円形開口１ａを有
する矩形のジヤケツト１の中に、前記中央円形開
口１ａの中に中央円孔２ａの周縁を露出した円形
のフレキシブル磁気シート２が回転自在に収納さ
れている。
このフレキシブル磁気デイスクを書込みおよび
読取り装置に装填するとき、第２図に示すように
位置決め部材の回転部３をシート２の下から当
て、この上からコレツト４を下げて、回転部３の
円形凹部３ａの中に圧入する。このとき、シート
２の中央円孔２ａの周縁は回転部３の円形凹部３
ａの位置に必ずしも一致しているわけではなく、
ずれていることが多いから、このままコレツト４
を下げると第３図のようにシート２の円孔２ａの
周縁の一部がコレツト４と回転部３の凹部３ａの
間に挾持され、偏心した状態で回転することにな
る。磁気デイスクシート２は常に中心が正しく回
転中心軸に一致して回転されなければ書込み、読
取りが正しく行なわれないから、このような位置
に保持されることは防止されねばならない。ま
た、このような状態で保持され、回転されると、
シート２の平面性が損なわれ、回転時にがたつく
という問題もある。コレツト４を下げてシート１
を挾持するとき、シート１が第３図のごとくでは
なく、第４図のごとく正しく装填されるために
は、シートの中央円孔周縁が適当な硬度を有し、
かつシート１とコレツト４および回転部３との摩
擦係数（μ）の小さいことが必要となる。
この目的のために、特願昭57−113422には、フ
レキシブル磁気デイスクの中央円孔周縁のシート
位置決め部材と接触する部分に、紫外線により重
合可能なポリオレフイン材と脂肪酸エステルとを
含有する保護層を設けて摩擦係数を減少させる方
法が開示されている。しかし、この方法のように
低分子量の潤滑剤を用いると、40℃〜50℃の比較
的高温および70〜80％の高湿雰囲気下では摩擦係
数が増大し、偏心装填を防止する効果が減少する
という欠点があらわれてくる。また、室温におい
てもくり返し装填を行なううちに、潤滑効果が減
少してくる。このことは、くり返し使用するうち
に表面から潤滑剤がねぐい去られていくことに起
因すると思われる。
本発明の目的は、温度変化に依存しない、とく
に高温高湿雰囲気下においても、まりくり返し装
填を行なつても潤滑剤の損失が少ない、したがつ
てフレキシブル磁気デイスクシートと位置決め部
材との間の摩擦係数を小さく保ち、装置に偏心す
ることなく装填されるフレキシブル磁気デイスク
を提供するにある。
本発明者らは上記目的を達成すべく鋭意検討し
た結果、(a)分子の末端および側鎖の少なくとも一
方にアクリル酸またはメタクリル酸とのエステル
結合を有する化合物、(b)紫外線を吸収することに
より光重合開始剤として作用する芳香族ケトン、
および(c)シリコーン系潤滑剤を含有する保護層を
磁気デイスクシートの中央円孔周縁部に設け、紫
外線照射により該層を重合、硬化させることによ
つて著しい好結果が得られることを見いだし、本
発明にいたつた。
すなわち、本発明はフレキシブル磁気デイスク
シート中央円孔周縁のシート位置決め部材との接
触部分に、(a)分子の主鎖末端および側鎖の少なく
とも一方にアクリル酸またはメタクリル酸とのエ
ステル結合を有する化合物、及び(b)芳香族ケトン
とよりなる組成物の紫外線照射重合物、および(c)
シリコーン系潤滑剤を含有する保護層を設けるこ
とを特徴とするフレキシブル磁気デイスクに関す
る。
本発明中(a)として示した化合物、分子主鎖末端
および側鎖の少なくとも一方にアクリル酸または
メタクリル酸とのエステル結合を有するものであ
り、その数は分子量1000あたり１〜10個、好まし
くは１〜６個、さらに好ましくは２〜４個であ
る。その分子量は特に限定されないが500〜30000
が好ましく、1000〜20000のオリゴマーからポリ
マー領域のものがさらに好ましい。主鎖の骨格
は、ポリエステル骨格、ポリウレタン骨格、ポリ
エーテル骨格、ポリカーボネート骨格、エポキシ
樹脂の骨格などが好ましく、それらの混合された
骨格であつてもまたそれらを二種以上混合して使
用してもよい。
本発明中(b)として示した光重合開始剤である芳
香族ケトンは、特に限定されないが、紫外線照射
光源として通常使用される水銀灯の輝線スペクト
ルを生ずる254、313、365nｍの波長において吸
光係数の比較的大なるものが好ましい。その代表
例としては、アセトフエノン、ベンゾフエノン、
ベンゾインエチルエーテル、ベンジルメチルケタ
ール、ベンジルエチルケタール、ベンゾインイソ
ブチルケトン、ヒドロキシジメチルフエニルケト
ン、１−ヒドロキシシクロヘキシルフエニルケト
ン、２−２ジエトキシアセトフエノン、
Michler′sケトンなどがあり、種々の芳香族ケト
ンが使用できる。
芳香族ケトンの混合比率は、化合物(a)100重量
部に対し0.5〜20重量部、好ましくは２〜15重量
部、さらに好ましくは３〜10重量部である。
本発明中(c)として示したシリコーン系潤滑剤と
しては、通常シリコーン油と呼ばれる比較的低重
合度で種々の分子量のものの混合物であるジメチ
ルポリシロキサンおよびメチルフエニルポリシロ
キサンなどが一般的であるが、種々の置換基によ
る、いわゆる変性シリコーンもまた使用できる。
たとえば、フツ素変性、炭素数１〜５のアルキル
変性、炭素数６〜22の脂肪酸変性、アルコール変
性、エポキシ変性、またはアミノ変性などであ
る。これらの変性により前記(1)および(2)の化合物
との相溶性を向上させることも可能である。
シリコーン系潤滑剤はその粘度が１〜５×
106cs（25℃）、さらに102〜104cs（25℃）であるも
のが好ましい。
シリコーン系潤滑剤の混合比率は化合物(a)100
重量部に対して、0.5〜20重量部、好ましくは２
〜15重量部、さらに好ましくは３〜10重量部であ
る。
前記(a)、(b)、および(c)の化合物を混合して塗液
を調製する場合、種々の有機溶媒を必要に応じて
使用できるが、化合物(a)が常温で液体である場合
無溶媒でもよい。使用できる有機溶媒としてはア
セトン、メチルエチルケトン、メチルイソブチル
ケトン、シクロヘキサノン等のケトン系；メタノ
ール、エタノール、プロパノール、ブタノール等
のアルコール系；酢酸メチル、酢酸エチル、酢酸
ブチル、乳酸エチル、酢酸グリコールモノエチル
エーテル等のエステル系；エーテル、グリコール
ジメチルエーテル、グリコールモノエチルエーテ
ル、ジオキサン等のグリコールエーテル系；ベン
ゼン、トルエン、キシレン等のタール系（芳香族
炭化水素）；メチレンクロライド、エチレンクロ
ライド、四塩化炭素、クロロホルム、エチレンク
ロルヒドリン、ジクロルベンゼン等があげられ
る。
前記(1)〜(3)の化合物を混合した塗液をフレキシ
ブル磁気デイスクシートの中央円孔周縁に塗布す
る際、その塗布量は、溶媒を除いて２〜50ｇ／m2
であり、５〜30ｇ／m2が好ましく、さらに10〜20
ｇ／m2であることが好ましい。紫外線照射により
重合、硬化した後の塗布厚は１〜50μ、好ましく
は５〜30μ、さらに好ましくは10〜20μである。
塗布量、したがつて厚みが上記の範囲より大のと
き、操作中にいわゆるトラツクずれが生じてくる
恐れがあり好ましくない。また小のとき、十分な
効果はえられない。
以下に本発明を実施例により説明する。
第５図は本発明の実施例を示すものであり、フ
レキシブル磁気シート１０の中央円孔１０ａの周
縁にそつて、表裏両面に本発明による保護層１１
が塗布される。保護層の巾は３mmとした。実施例
および比較例のそれぞれの組成を下記に示す。
実施例 １
東亜合成製ポリウレタンアクリレートＭ−1100
100重量部
信越化学製ミリスチン酸変性シリコーンTA930
３重量部
ベンジルジメチルケタール ９ 〃
実施例 ２
東亜合成製ポリウレタンアクリレートＭ−1100
100重量部
信越化学製フツ素ミリスチン酸変性シリコーン
TA4230 ９ 〃
ベンジルジメチルケタール ３ 〃
実施例 ３
東亜合成製ポリウレタンアクリレートＭ−1100
100重量部
信越化学製ミリスチン酸変性シリコーンTA930
５ 〃
ベンゾインエチルエーテル ９ 〃
実施例 ４
東亜合成製ポリエステルアクリレートＭ−8030
100重量部
信越化学製フツ素ミリスチン酸変性シリコーン
TA4230 ５ 〃
ベンゾインエチルエーテル ５ 〃
比較例 １
東亜合成製ポリウレタンアクリレートＭ−1100
100重量部
ブチルステアレート ５ 〃
ベンジルジメチルケタール ５ 〃
比較例 ２
保護層なし
上記組成による塗液を調整し、フレキシブル磁
気デイスクシートの中央円孔周縁に塗設量が15
ｇ／m2、したがつて塗厚が13μとなるよう塗設
後、80W／cmの高圧水銀灯により紫外線照射し重
合、硬化させた。
前記実施例および比較例における上記位置決め
部材との摩擦係数測定と、デイスクドライブへの
装填テストを25℃80％RHおよび40℃80％RHの
二条件下で行なつた結果を表に示す。
摩擦係数の測定は、位置決め部材（コレツト）
を磁気シート上で送り速度0.8mm／sec.で摩擦し、
その際の付加荷重を70ｇ重として行なつた。位置
決め部材（回転部）との間の摩擦係数に関しても
同様に測定を行なつた。
デイスクドライブへの装填テストに使用したド
ライブは、Ｙ−Ｅデータ社製YD−280および
380、松下通工社製JA751および561、三菱電機社
製Ｍ−2894および4853である。
結果は、くり返し10回の装填を行ない全ドライ
ブについて不良の生じなかつたものに〇、１ケ以
上のドライブで不良の生じたものには×を表示し
た。
FIELD OF THE INVENTION This invention relates to improvements in flexible magnetic disks, and more particularly to flexible magnetic disks that can be loaded without eccentricity into writing and reading devices. A flexible magnetic disk sheet is housed in a jacket, a central circular hole provided in both the jacket and the sheet engages a sheet positioning member of a writing/reading device, and the sheet is rotated to magnetically record on the sheet; Alternatively, there is a known device that performs magnetic reproduction from a sheet. In this type of magnetic disk, the sheet is stored in the jacket with some extra space, so the sheet inside may shift to a lopsided position within the jacket during storage, handling, or carrying, and when the disk is loaded into the device. The circular hole in the center of the sheet may be eccentric with respect to the position of the positioning member (collect) of the device, and the sheet may be held at an eccentric position during positioning. Figures 1A and 1B show this type of flexible magnetic sheet, in which a rectangular jacket 1 has a circular opening 1a in the center, and a circular hole 2a with the peripheral edge of a central circular hole 2a exposed in the central circular opening 1a. A flexible magnetic sheet 2 is rotatably housed. When loading this flexible magnetic disk into a writing/reading device, as shown in FIG. Press fit into 3a. At this time, the periphery of the central circular hole 2a of the seat 2 is connected to the circular recess 3 of the rotating part 3.
It does not necessarily correspond to the position of a,
There are many cases where it is misaligned, so please correct it as is.
When the seat 2 is lowered, a part of the periphery of the circular hole 2a of the seat 2 is held between the collet 4 and the recess 3a of the rotating part 3, as shown in FIG. 3, and the seat 2 rotates eccentrically. Since writing and reading cannot be performed correctly unless the magnetic disk sheet 2 is rotated so that its center is always aligned with the rotation center axis, it must be prevented from being held in such a position. Also, when held and rotated in this state,
There is also the problem that the flatness of the sheet 2 is impaired and it wobbles during rotation. Lower collector 4 and seat 1
In order for the sheet 1 to be loaded correctly as shown in FIG. 4 instead of as shown in FIG.
In addition, the coefficient of friction (μ) between the seat 1, the collet 4, and the rotating portion 3 must be small. For this purpose, Japanese Patent Application No. 57-113422 proposes that a protective layer containing a polyolefin material polymerizable by ultraviolet rays and a fatty acid ester be applied to the portion of the flexible magnetic disk that contacts the sheet positioning member around the central hole. A method for reducing the coefficient of friction is disclosed. However, when a low molecular weight lubricant is used as in this method, the coefficient of friction increases at relatively high temperatures of 40°C to 50°C and high humidity of 70% to 80%, reducing the effectiveness in preventing eccentric loading. The disadvantages of doing so become apparent. Further, even at room temperature, the lubricating effect decreases as loading is repeated. This seems to be due to the fact that the lubricant is washed away from the surface during repeated use. It is an object of the present invention to reduce the loss of lubricant even when repeatedly loaded, even in a high temperature and high humidity atmosphere, which does not depend on temperature changes. To provide a flexible magnetic disk that maintains a small coefficient of friction and can be loaded into a device without eccentricity. As a result of intensive studies to achieve the above object, the present inventors found that (a) a compound having an ester bond with acrylic acid or methacrylic acid in at least one of the terminal and side chain of the molecule, and (b) a compound that absorbs ultraviolet rays. aromatic ketone, which acts as a photoinitiator by
and (c) found that remarkable results could be obtained by providing a protective layer containing a silicone lubricant around the central hole of the magnetic disk sheet, and polymerizing and curing the layer by irradiating ultraviolet rays; We have arrived at the present invention. That is, the present invention provides a flexible magnetic disk sheet with a compound having an ester bond with acrylic acid or methacrylic acid at the end of the main chain and at least one of the side chains of the flexible magnetic disk sheet in the contact area with the sheet positioning member around the central hole of the flexible magnetic disk sheet. , and (b) an ultraviolet irradiated polymer of a composition comprising an aromatic ketone, and (c)
The present invention relates to a flexible magnetic disk characterized in that it is provided with a protective layer containing a silicone lubricant. The compound shown as (a) in the present invention has an ester bond with acrylic acid or methacrylic acid at least one of the end of the main chain and the side chain of the molecule, and the number thereof is 1 to 10 per 1000 molecular weight, preferably The number is 1 to 6, more preferably 2 to 4. Its molecular weight is not particularly limited, but is between 500 and 30,000.
are preferred, and those in the oligomer to polymer range of 1,000 to 20,000 are more preferred. The main chain skeleton is preferably a polyester skeleton, a polyurethane skeleton, a polyether skeleton, a polycarbonate skeleton, an epoxy resin skeleton, etc., and a mixture of these skeletons or a mixture of two or more of them may be used. good. The aromatic ketone that is the photopolymerization initiator shown as (b) in the present invention is not particularly limited, but has an extinction coefficient at wavelengths of 254, 313, and 365 nm, which produce the bright line spectrum of a mercury lamp commonly used as an ultraviolet irradiation light source. A relatively large one is preferable. Representative examples include acetophenone, benzophenone,
Benzoin ethyl ether, benzyl methyl ketal, benzyl ethyl ketal, benzoin isobutyl ketone, hydroxydimethyl phenyl ketone, 1-hydroxycyclohexyl phenyl ketone, 2-2 diethoxyacetophenone,
Various aromatic ketones can be used, including Michler's ketone. The mixing ratio of the aromatic ketone is 0.5 to 20 parts by weight, preferably 2 to 15 parts by weight, and more preferably 3 to 10 parts by weight per 100 parts by weight of compound (a). As the silicone lubricant shown as (c) in the present invention, dimethylpolysiloxane and methylphenylpolysiloxane, which are mixtures of lubricants with a relatively low degree of polymerization and various molecular weights, which are usually called silicone oil, are common. However, so-called modified silicones with various substituents can also be used.
Examples include fluorine modification, alkyl modification having 1 to 5 carbon atoms, fatty acid modification having 6 to 22 carbon atoms, alcohol modification, epoxy modification, and amino modification. It is also possible to improve the compatibility with the compounds (1) and (2) above by these modifications. Silicone lubricant has a viscosity of 1 to 5
10 6 cs (25°C), more preferably 10 2 to 10 4 cs (25°C). The mixing ratio of silicone lubricant is compound (a) 100
0.5 to 20 parts by weight, preferably 2 parts by weight
~15 parts by weight, more preferably 3 to 10 parts by weight. When preparing a coating liquid by mixing the compounds (a), (b), and (c) above, various organic solvents can be used as necessary, but if compound (a) is liquid at room temperature, It may be solvent-free. Organic solvents that can be used include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; alcohols such as methanol, ethanol, propanol, and butanol; methyl acetate, ethyl acetate, butyl acetate, ethyl lactate, acetic acid glycol monoethyl ether, etc. Ester systems; glycol ether systems such as ether, glycol dimethyl ether, glycol monoethyl ether, and dioxane; tar systems (aromatic hydrocarbons) such as benzene, toluene, and xylene; methylene chloride, ethylene chloride, carbon tetrachloride, chloroform, and ethylene Examples include chlorohydrin and dichlorobenzene. When applying a coating liquid containing a mixture of the compounds (1) to (3) above to the periphery of the central hole of a flexible magnetic disk sheet, the amount of application is 2 to 50 g/m 2 excluding the solvent.
and preferably 5 to 30 g/ m2 , more preferably 10 to 20 g/m2.
g/m 2 is preferred. The coating thickness after polymerization and curing by ultraviolet irradiation is 1 to 50 microns, preferably 5 to 30 microns, and more preferably 10 to 20 microns.
When the coating amount, and hence the thickness, is larger than the above range, it is undesirable because so-called track deviation may occur during operation. Also, when the child is small, sufficient effects cannot be obtained. The present invention will be explained below using examples. FIG. 5 shows an embodiment of the present invention, in which a protective layer 11 according to the present invention is formed on both the front and back surfaces along the periphery of the central circular hole 10a of the flexible magnetic sheet 10.
is applied. The width of the protective layer was 3 mm. The compositions of Examples and Comparative Examples are shown below. Example 1 Toagosei Polyurethane Acrylate M-1100
100 parts by weight Myristic acid modified silicone TA930 manufactured by Shin-Etsu Chemical
3 parts by weight benzyl dimethyl ketal 9 Example 2 Polyurethane acrylate M-1100 manufactured by Toagosei Co., Ltd.
100 parts by weight Shin-Etsu Chemical fluorine myristic acid modified silicone
TA4230 9 Benzyl dimethyl ketal 3 Example 3 Toagosei polyurethane acrylate M-1100
100 parts by weight Myristic acid modified silicone TA930 manufactured by Shin-Etsu Chemical
5 〃 Benzoin ethyl ether 9 〃 Example 4 Polyester acrylate M-8030 manufactured by Toagosei Co., Ltd.
100 parts by weight Shin-Etsu Chemical fluorine myristic acid modified silicone
TA4230 5 〃 Benzoin ethyl ether 5 〃 Comparative example 1 Toagosei polyurethane acrylate M-1100
100 parts by weight Butyl stearate 5 Benzyl dimethyl ketal 5 Comparative example 2 No protective layer A coating solution with the above composition was prepared, and a coating amount of 15% was applied to the periphery of the central hole of the flexible magnetic disc sheet.
After coating to a coating thickness of 13 μg/m 2 , the coating was polymerized and cured by irradiation with ultraviolet light using a high-pressure mercury lamp of 80 W/cm. The table shows the results of measurements of the coefficient of friction with the positioning member in the Examples and Comparative Examples and a loading test into a disk drive under two conditions: 25° C., 80% RH and 40° C., 80% RH. To measure the coefficient of friction, use the positioning member (collect).
is rubbed on a magnetic sheet at a feed rate of 0.8 mm/sec.
The additional load at that time was 70g. The coefficient of friction with the positioning member (rotating part) was similarly measured. The drives used for the disk drive loading test were YD-280 and YE Data Co., Ltd.
380, JA751 and 561 manufactured by Matsushita Tsuko Co., Ltd., and M-2894 and 4853 manufactured by Mitsubishi Electric Corporation. The results are shown as ○ if no defects occurred in all drives after repeated loading 10 times, and × if defects occurred in one or more drives.
【表】
比較例１では本発明の構成に加えて磁気記録媒
体の調製の際通常使用される潤滑剤を用いている
がその結果は本発明実施例中のシリコーン系潤滑
剤を用いた場合のそれにくらべ摩擦係数が高く、
装填テスト結果も劣る。また保護層なしの場合は
いうまでもなくさらに劣る。これらの実施例より
本発明による保護層が高温高湿下においても摩擦
係数を低く保持し、装填テストにおいても顕著な
改良効果を示すことがわかる。[Table] In Comparative Example 1, in addition to the structure of the present invention, a lubricant commonly used in the preparation of magnetic recording media was used. Compared to that, the coefficient of friction is higher,
Loading test results are also poor. Needless to say, the performance without a protective layer is even worse. These examples show that the protective layer according to the present invention maintains a low coefficient of friction even under high temperature and high humidity conditions, and exhibits a remarkable improvement effect in loading tests.
第１Ａ図はフレキシブル磁気デイスクの例を示
す平面図、第１Ｂ図はその断面図、第２図はフレ
キシブル磁気デイスクを装置の位置決め部材に装
填する状態を示す一部断面図、第３図は同じくそ
のシートが偏心したまま保持される状態を示す一
部断面図、第４図は同じくそのシートが正しく位
置決めされた状態を示す一部断面図、第５図は本
発明の一実施例のシート部を示す平面図、
１……ジヤケツト、１ａ……ジヤケツト開口、
２……磁気シート、２ａ……中央円孔、３……位
置決め部材（回転部）、３ａ……円形凹部、４…
…位置決め部材（コレツト）、１０……磁気シー
ト、１０ａ……中央円孔、１１……保護層。
Fig. 1A is a plan view showing an example of a flexible magnetic disk, Fig. 1B is a sectional view thereof, Fig. 2 is a partial sectional view showing a state in which the flexible magnetic disk is loaded into the positioning member of the device, and Fig. 3 is the same. FIG. 4 is a partial sectional view showing a state in which the seat is held eccentrically; FIG. 4 is a partial sectional view showing the seat properly positioned; FIG. 5 is a partial sectional view showing the seat in an embodiment of the present invention. A plan view showing 1...jacket, 1a...jacket opening,
2...Magnetic sheet, 2a...Central circular hole, 3...Positioning member (rotating part), 3a...Circular recess, 4...
...Positioning member (collection), 10...Magnetic sheet, 10a...Central circular hole, 11...Protective layer.
Claims (1)
周縁に、(a)分子の主鎖末端および側鎖の少なくと
も一方にアクリル酸またはメタクリル酸とのエス
テル結合を有する化合物及び(b)芳香族ケトンとよ
りなる組成物の紫外線照射重合生成物と(c)シリコ
ーン系潤滑剤を含有する保護層を設けることを特
徴とするフレキシブル磁気デイスク。1. A composition consisting of (a) a compound having an ester bond with acrylic acid or methacrylic acid at the end of the main chain and at least one of the side chains of the molecule, and (b) an aromatic ketone, is placed around the central hole of the flexible magnetic disk sheet. 1. A flexible magnetic disk characterized in that it is provided with a protective layer containing an ultraviolet irradiation polymerization product of a substance and (c) a silicone lubricant.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58130438A JPS6022785A (en) | 1983-07-18 | 1983-07-18 | Flexible magnetic disk |
| DE3426502A DE3426502C2 (en) | 1983-07-18 | 1984-07-18 | Flexible magnetic disc |
| US06/632,151 US4581270A (en) | 1983-07-18 | 1984-07-18 | Flexible magnetic disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58130438A JPS6022785A (en) | 1983-07-18 | 1983-07-18 | Flexible magnetic disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6022785A JPS6022785A (en) | 1985-02-05 |
| JPH0136196B2 true JPH0136196B2 (en) | 1989-07-28 |
Family
ID=15034241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58130438A Granted JPS6022785A (en) | 1983-07-18 | 1983-07-18 | Flexible magnetic disk |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4581270A (en) |
| JP (1) | JPS6022785A (en) |
| DE (1) | DE3426502C2 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6080132A (en) * | 1983-10-07 | 1985-05-08 | Fuji Photo Film Co Ltd | Formation of protective layer of flexible magnetic disk |
| JPS60109031A (en) * | 1983-11-17 | 1985-06-14 | Fuji Photo Film Co Ltd | Flexible magnetic disk |
| JPS60111340A (en) * | 1983-11-21 | 1985-06-17 | Fuji Photo Film Co Ltd | Flexible magnetic disc |
| JPS60131631A (en) * | 1983-12-19 | 1985-07-13 | Fuji Photo Film Co Ltd | Flexible magnetic disk |
| US4707392A (en) * | 1984-02-29 | 1987-11-17 | Fuji Photo Film Co., Ltd. | Flexible magnetic disk |
| JPH0685267B2 (en) * | 1984-05-07 | 1994-10-26 | 富士写真フイルム株式会社 | Flexible magnetic disk |
| JPS61115238A (en) * | 1984-11-09 | 1986-06-02 | Fuji Photo Film Co Ltd | Flexible magnetic disk and its manufacture |
| JPS6337823A (en) * | 1986-07-30 | 1988-02-18 | Columbia Magune Prod Kk | Flexible magnetic disk and its manufacture |
| US5030478A (en) * | 1989-03-03 | 1991-07-09 | International Business Machines Corporation | Process for bonding lubricants to thin film recording media |
| US5085911A (en) * | 1989-06-13 | 1992-02-04 | Fuji Photo Film Co., Ltd. | Flexible magnetic disc with a two layer protective coating which top layer is a ultra violet radiation cured compound with specified elasticity modulus |
| JP2687245B2 (en) * | 1989-09-29 | 1997-12-08 | 富士写真フイルム株式会社 | Manufacturing method of magnetic recording medium |
| JP2658815B2 (en) * | 1993-07-29 | 1997-09-30 | 日本電気株式会社 | Magnetic storage |
| JP2003162879A (en) * | 2001-11-26 | 2003-06-06 | Fuji Photo Film Co Ltd | Disk-like magnetic recording medium |
| FR2850785B1 (en) * | 2003-01-30 | 2006-05-26 | Marie Therese Iruela Guillot | PROTECTIVE DEVICE FOR OPTICAL DISK |
| JP2004253015A (en) * | 2003-02-18 | 2004-09-09 | Fuji Photo Film Co Ltd | Master carrier for magnetic transfer |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3466156A (en) * | 1966-12-01 | 1969-09-09 | Ncr Co | Magnetic record members |
| JPS4815009B1 (en) * | 1969-11-26 | 1973-05-11 | ||
| US4239828A (en) * | 1976-03-29 | 1980-12-16 | Minnesota Mining And Manufacturing Company | Self-lubricating magnetic recording diskette |
| US4309482A (en) * | 1979-07-19 | 1982-01-05 | Matsushita Electric Industrial Co., Ltd. | Magnetic recording medium |
| JPS5625232A (en) * | 1979-08-06 | 1981-03-11 | Sony Corp | Magnetic recording medium |
| JPS56159838A (en) * | 1980-05-12 | 1981-12-09 | Tokyo Jiki Insatsu Kk | Magnetic recording medium |
| JPS5715231A (en) * | 1980-07-03 | 1982-01-26 | Sony Corp | Magnetic recording medium |
| US4387114A (en) * | 1980-11-20 | 1983-06-07 | Verbatim Corporation | Spindle aperture reinforcement for a floppy disk |
| JPS57150136A (en) * | 1981-03-09 | 1982-09-16 | Fuji Photo Film Co Ltd | Magnetic recording medium and its manufacture |
| US4404247A (en) * | 1982-07-02 | 1983-09-13 | Minnesota Mining And Manufacturing Company | Protective covering for magnetic recording medium |
-
1983
- 1983-07-18 JP JP58130438A patent/JPS6022785A/en active Granted
-
1984
- 1984-07-18 DE DE3426502A patent/DE3426502C2/en not_active Expired - Lifetime
- 1984-07-18 US US06/632,151 patent/US4581270A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4581270A (en) | 1986-04-08 |
| JPS6022785A (en) | 1985-02-05 |
| DE3426502C2 (en) | 1995-06-29 |
| DE3426502A1 (en) | 1985-01-31 |
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